Consolidated Statements of Changes Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid In Capital	Accumulated Deficit	Accumulated Other Comprehensive (Loss) /Gain	Non-controlling Interests
Balance at beginning of period at Dec. 31, 2018	$ 1,927	$ 87	$ 1,938	$ (181)	$ (19)	$ 101
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(522)			(500)		(22)
Foreign currency translation	(24)				(24)
Pension liability net of tax	(1)				(1)
Stock based compensation	5		5
Issuance of common shares	403	24	379
Purchase of minority interest	0		(14)			14
Equity component of issuance of convertible notes, net of taxes (Note 5)	35		35
Dividend	(5)					(5)
Balance at end of period at Dec. 31, 2019	1,818	111	2,343	(681)	(44)	89
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(544)			(545)		1
Foreign currency translation	48				47	1
Pension liability net of tax	(1)				(1)
Stock based compensation	6		6
Business divestitures	(88)				3	(91)
Balance at end of period at Dec. 31, 2020	1,239	111	2,349	(1,226)	5	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(385)			(385)
Foreign currency translation	(19)				(19)
Pension liability net of tax	6				6
Stock based compensation	11		11
Issuance of common shares	1	1
Balance at end of period at Dec. 31, 2021	$ 853	$ 112	$ 2,360	$ (1,611)	$ (8)	$ 0